Tool for inserting or removing screws



j 927. g 1,631 489 J. KIEWICZ TOOL FOR. INSERTING 0R REMOVING SCREWSFiled Nov. 18, 1924 Fig.1.

lnvenTor. John Kiewic;

Attys.

getherin such a, way as to prevent unau- Patented June 7, 1927.

NITED STAT-Es f JOHN KInw'Icz, or BOSTON, MASSACHUSETTS, Assumes rornnfnnncn BU'r'ronHoLn MACHINE ooMPANxoF osroN, 'ivmssacnusnrrs; ACORPORATION or AINE.

7 moon For msnnrrive on REMOVING scam arse,

At ncaticn filed November 18; 1924,.- Serial no; #50523,

I This invention relates to a'tool for manipulating a screw havingaheadprov ded with two portions of different diameters,

both of which are externally screw threaded. This form of scre'w isuseful for a great variety of purposes wherever it is desired to connect,two articles'or parts of articles to:

' thoriz'ed persons from removing the screw. Merely toillustrate onepossible usejfor the invention 1 would refer to its use n connectionwith theattachment of a counter orindicator to some machine. It isacommon practice in. some industries for the manufacturer to rent some ofthe machines which he is using and to pay for the use of the machine. asum dependenuupon; :the amount of work performed by the mach ne. Forinstance, in the case of a clothing manue facturer, it is more or lesscommon for, such a a person to, rent orleasebuttonhole sewing machinesfor use in his business and to pay a a royalty or license fee which isdetermined "by the number.- of buttonholes made.

In such case it is customary to attach a counter. to a the buttonholesewing machine which will count either the buttonholes or stitches asthey are made, these counters usually being attached to. the machinesby; means 30 o-t'screws. .Oneuse to which the'screw thread .illusitratedis specially adapted is that of secur ing-such' counters or indicators'tojthemachineso as tomake it impossible for any unauthorized persontoremove-the counter for the purpose of rel-adjusting it or for any otherpurpose; The above reference '-to the use ofthe screw inattaching an;indicator to buttonhole sewing machines 1 is, however, simply for thepurpose of illustrating-one .possible use thereof. I

":HThe screw abov e.referred to: is herein .I'The'jtool embodying my isspecially'designedto provide a gripping f 5%] shown as having its'headenclosed within a protected shell'so as to make it impossible f for anunauthorized person to grip thehead and turn the screw" by a 7 pair ofpliers or sinnlar nstruments. 4

engagement with the screw head while}.-the

isleeve.

present invention ings a selected embodiment thereof which features willbe claims; 3

1 .Fi l is way in which the screw may-beusedtj pointed out p in theappended mannenof inserting "the screw; I i 'Fig, 3 isasimilar vie]showing thej mannerin which thescrew isremoved;

V In ig. 1,-1 and2indicate two parts; that are; to be secured togetherby means of my a fragmentary view showing the "to Fig. 2 is a sectionalviewillustrating the improved scre w The part 1 may ,be amachine ofsomeitypeand the part 2 maybe a counter or indicator. tobe attached tothe partil, or thesepa-rtsgl and 2 may be two parts which are'tobe-secured'together. .f 7,

The screw for connecting the parts lland 2 is formed witha screwthreaded' shank l3 vwhich is adapted to screw mada e-1 w nd-wi head hidn ludes ng '0 c a 1 that is "adapted twnea e' h Par- 2. For protectingthe screw against maj Propos :tPLB lM Y-fi Sh el 5 wh c i the nature ofacylindrical shell that encloses ,th e head of the screw This shield is acup-shaped member and hasahole "6 in betweenthe collar 4 and the jpart2. when .nipulation, by an .unauthorized person, I

its end t through/flwhichthe Shank 3 ofthe screwnextends, said head7,1being confined the shield is in' place it protectsthehead of thescrew fron improper 'manipulation;

In order topnovideiforinserting the screw, or removlng 1t I 'propose tomalrethehead pf. special construction. and to employ special tool formanipulating thescrewa- In the constructionherein 'shown thehead of thescrew olnprises[the two; parts ennu -9 ot'different-diameter;.The part8o t la rger i diameter has formed ,ther,eon a -coar'se screw threadQlOwhich isgin the samedirectionas the screw'threads o rthesh ank g; Thepor- 'tionl 9 ;of; .smaller diameter is ,p'rovided with v relativelyfine screw threads fll also extending, in the samedirection a. size toenter the open; end of the protecting,

The p al't w i i' eior removing the screw comprises ja-tubular member 12of I latter is situated within the-protecting i 7 sleevefigand having atits i nnerendan in,

ternal screw thread 13 which fits the coarse screw thread 10. The toolalso includes a locking member 16 which extends axially of the tubularmember 12 andhas a't' its inner end a screw-threaded socket 19'havingrelatively fine screw threads adapted to fit the screw-threaded; portion11. The diameter of the l ck g me 'lbe .6 an th diamet of the bore ofthe member 12 is somewhat greater than the diameter of-the screw'threaded portion 13 so that when the locking member 16 is screwed ontotheportion 9 it will lock the member 12 from being unscrewed from theportion8. H

The member 12 may conveniently-have handles 17 by which it may be turnedand the-locking member 16 which extends beyond the member '12ma'y alsoconveniently have handles 18 by which it may be turned."

l The looking member 1 6'is tree tobe moved longitudinally oftheine'mbei." 12 and also is free to t urn'in the member- In using the"device for inserting the screw the member 12 will be screw threadedonto the portion 8 of the head until the end, of the member 12' engagesthe collar 1; This engagement will reven t "further turning movement ofthe member '12 relative tothe screw so-that it the meinber-l2 is turnedby the handles in the proper direction the screwthreaded, shank 36f thescrew will be screwed -into the member 1.

In: placing the screw-in position it will, be understood thatthe-protecting shield 5 will first he slipped over the head of the screwas shown in thedrawings so that when the screw is tightened the shield 5will 'en'close the head. After the screw "has been set up tight thenthetoolf may be removed from the head or t-hesciew thus leaving thescrew i'n its protected conditionshown in Fig. 1'. f

' For removingthescreW the member 12 is first screwed onto "theipo'rtion8 of the head untilf'sa'id iii-ember engages the collar t and area thelocking member 1 6 is inserted and screwed 01 m the portion 11 o'fsma-ller diameter and'havmg the finer'screwthreads as sliowlrin Fig.When the locking mem- 7 ber 16 is screwed up tight it acts to lock themember 12 m the screw head soas to prevent it trom screwing oit from'the screw head as isturn-edbackwardly. 1

This locking action results from the fact that the screw threads l0farecoarser than the screw threads lfl and' because of this fact when the.tool is turned :backw'ardly the tubular part- 12 wilht'end to unscrewfrom the 7 head of the screw faster than the "locking member'lti and byreason of this fact it will bind against *the end of the member lfisince said end is larger than' the screw threade'd portion of the boreofthe tubular member 12; The tool is thus locked to the screw and cannotbe removed therefrom until the looking member has been unscrewed fromthe portion 9. So long as the parts are in the relative position shownin Fig. 3, therefore, the tool may be used for unscrewing the shank '3ofth'e screw fronithe part 1. "In inserting the screw it is onlynecessary to use the tubular member 12 as the latter will become locked.to the screw as soon asit is rewed dawn. eas e t he fisi e 41 removingor backing oi? the screw, however, it is-necessary' to" use, the lockingmember 16 to lock the member 12 to the screw head as shown in Fig;lVhile I haveillustrated one embodiment of the invention I do notwish tobe limited to the" constructional features shown. cilaiin': w 1 1. Atool for removing or inserting a screw having a screw-threaded shank'anda head, said head having thereon acoarse and a line screw thread; the"coarse screw thread being on a'portion' of larger diameter J than. thefinescrew thr-ead, said toolcomprising a tubular member havingfon oneend, interior tubular member: is locked to the head and the screw can bemanipulated by'manipulatingthe tubular member; I

2; 'Atoolfor inserting or removing a screw providedwith a 'head'havingtwo "portions of difierent'diameters,'both ofwhich'are externally screwthreaded with the screw threads on the larger portion coarser than thoseon -the 'smallerportioh', said-tool comprising a tubular member having,atone end screw threads' t'o engage the coarse screw threads oi 'thescrew head and provi'ded at the other end with a handle','and a lockingmember telescoping within the tubular memher and provided at one endwith screw threadsadaptedto'engage the finer screw threads of'thes'crew' head, said end of the lockingmember being larger than thescrew-' threaded portion of the bore of" the tubular member whereby 3when both the tubular member andthe locking member have been screwed tothe head the tubular member is 'tool"for inserting or removing a screwprovlded with a head havlngtwoportions of different 'diametersboth ofwhich are externally- 'screwthi'eaded with the screw threads on thelarger portion coarser than those on thes'maller portion, said toolcomprising atubular member having at one end screw threads to engage thecoarse screw threads of the screw head and provided at the other endwith a handle, and a locking member telescoping within thetubularmemberand provided with screw threads adapted to engage the finer screwthreads of the screw head, whereby when "both the tubular.

JOHN Kmw t

